Triangle by futaro

<? $a=fread(STDIN,3);while(1){$t=$i++;while(--$t){$r[$t][$i-$t]=++$v;if($v==$a)break 2;}}foreach(array_reverse($r)as$l)echo implode(" ",$l)."\r\n";

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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